Big Mouth Bubbler® - 6.5 Gallon Plastic Fermentor

SKU# U41965


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Big Mouth Bubbler® Plastic is a virtually indestructible fermentor, equipped with 3” thick anti-flex ribs, a punted bottom and decreased base diameter for extreme strength and durability. Its smaller footprint preserves precious brew cave space and allows for convenient storage inside a standard brewing bucket.

Included: Big Mouth Bubbler® - 6.5 Gallon Plastic Fermentor, single-port universal lid.
Required: Small Universal Stopper & airlock. Configure options below.

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Big Mouth Bubbler Plastic - 6.5 Gallon   +$29.99
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Big Mouth Bubbler™ - 6.5 Gallon Plastic Fermentor

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  • Big Mouth Bubbler® - 6.5 Gallon Plastic Fermentor
  • Big Mouth Bubbler® - 6.5 Gallon Plastic Fermentor


Product Details

Superior to a carboy, Big Mouth Bubbler® Plastic prevents off-flavors by enabling you to keep the lid on during testing and transfer, avoiding exposure to oxygen with standard-sized ports that can accommodate most fermentation-monitoring equipment.

The punted bottom promotes crystal-clear beer by efficiently settling out yeast from finished fermentations. Graduation marks make volume measurement instant and effortless. And, of course, its revolutionary wide mouth eliminates the nightmare of cleaning and sanitizing by giving you direct hands-on access to attack crusted krausen, while simultaneously offering unlimited flexibility in dry-hopping and flavor additions.

*The new Big Mouth Universal Lid (included) fits all Big Mouth Bubbler® Fermentors. The Big Mouth Bubbler® Universal Lid is just like a traditional carboy bung, only bigger! Just as easy to sanitize and set in place too. Ribbed silicone rings ensure a positive seal to keep out pests, while the non-threaded design allows the lid to move preventing an out-of-control fermentation from dangerously pressurizing your fermentor.

The optional Dual Port Lid allows for the use of a temperature controller probe. The ThermoStar Dual-Mode Digital Temperature Controller with optional 12" stainless probe ensures precise and repeatable fermentation temperatures!

Lid port works with our Small Universal Stopper or a standard 6.5 rubber stopper.

Important Note: Do not fill any Plastic Big Mouth Bubbler® fermenters with very hot liquid - temp should not exceed 140 degrees Farenheit (60 celcius)

BIG MOUTH BUBBLER® Product Specifications:
Capacity:5 gallon6.5 gallon
Height (w/lid, closed):22"23"
Fermentor Material:PETPET

Note: We recommend a soft cloth for cleaning the inside. Standard carboy brushes will scratch plastic fermenters leaving places for grime to hide. A warm cleaning solution will suffice. Do not use hot water on plastic fermenters of any sort. The Big Mouth Bubbler® is compatible with a standard carboy dryer when the dryer is used inverted.

*Pro Tip: Save your box and use it as a cover for your fermenter!

6.5 Gallon fermenters are perfect for the primary stage of beer or wine fermentation. The extra head space allows for the production of krausen on a 5 gallon batch of beer. Also available as a 5-gallon secondary fermentor.
3.9 / 5.0
125 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
AG They switched the lids
The first time I bought these, they had the screw top lids, which worked perfectly for 2F. I reordered, not thinking to check, and all my new ones came with the universal lids. I've had the universal lids in the past and they are a f***ing nightmare. I don't know why they don't at least offer the option of the old lids. Looks like the ported lids are available, but not the piece that screws them on. I am SO peeved I have to deal with these lids again. Please consider reinstating the old ones as an option. I feel like I just wasted $120.
September 2, 2016
Love it
Love it
October 26, 2015
Very nice
Brewer my first batch with the big mouth, a hoppy IPA so lots of hops to clean. It was a breeze. I'll be buying more of these.
November 30, 2015
luv it!
bought to 2 port lid and easy to clean!
November 30, 2015
6.5 big mouth bubbler
bought bubbler to start an australian shiraz and it has worked great so far. instructions said to stir in 3 days, I removed the air lock and stirred away!!! it was so easy and did not have to remove the lid. works real good for me. I plan on replacing some of my heavy glass carboys with these. Thanx NB for a great product.
March 24, 2016
Great product
Great product
March 25, 2016
Great fermenter
In my opinion the big mouth bubbler is much better than the traditional Carboy. Much easier to clean and adding dry hops is much easier also.
May 4, 2016
After years of brewing....
This is definitely THE best fermenter I've used, from glass, to bucket to other plastic bottle types. Easy to clean and add ingredients after the initial fill like fruit, more water or yeast/yeast nutrient, when warranted. Really easy to scoop out tester samples too, which come to think about it.... I may need to deduct points for that because it's counter productive....: )
September 30, 2015
Big Mouth Bubbler
Super easy to clean. Already used for two batches and it still looks brand new.
January 1, 2016
Great product
I have 2 6.5s for primary and 2 5 gals for 2ndary.
December 2, 2015
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 12 questions Browse 12 questions and 20 answers
Are these Bubbler Plastic Fermenters BPA free?
A shopper on Nov 29, 2016
How do these hold up to cold crashing? Will they collapse or crack?
A N on Feb 26, 2016
BEST ANSWER: Cold crashing an IPA in one of these for a week at 38F, no issues at all yet
Is there a solution for the universal lid popping out during active fermentation? Would the normal screw on lid work better during active fermentation?
joseph n on Jun 26, 2016
BEST ANSWER: If the lid starts popping off during the active parts of fermentation, you can just place a weight on the lid. If it pops up slightly, but the gasket is still making contact with the sides, the fermentor should still stay sealed.
Might be dumb question but this product comes with a lid yes?
B R on Dec 27, 2015
BEST ANSWER: Yes. Comes with a lid and threaded collar. If you haven't yet, you'll probably also want to pick up a drilled stopper to accommodate an air lock
what is the hottest this carboy can get before damage occurs?
T H on Aug 2, 2016
BEST ANSWER: Temperatures over 140 F will damage these plastic fermenters, so care must be taken when cleaning them or using them. We do not recommend pouring hot wort into them in any situation. - Mike W, Northern Brewer
Does this come with the universal lid or the standard lid? Also, are people having issues with universal lid popping off on the plastic big mouths like people have observed happening in the glass versions?
J A on Jun 26, 2016

Thank you for your question. This does indeed come with the new universal lid. Anytime you have very active fermentation you can run the chance of the lid and/or bung popping out.

Will the Brew Hauler work with these? I know there is a special harness for the BMBs, but I already have several Brew Haulers and would like to avoid buying yet another carry strap... Thanks!
J K on Apr 22, 2016
BEST ANSWER: The brew hauler will work on a BMB plastic. Not as well, but well enough to avoid getting a new strap! Cheers!
I never seem to get any bubbles from my airlocks. They are always seated tighly yet still no bubbles. Must be a leak in the lid. Is there supposed to be a gasket?
R E on Jan 14, 2016
BEST ANSWER: No gasket - I've personally never had an issue with there being no bubbles. My question would be if you checked the seal before putting any wort in? I did this by putting the lid on tight, putting my blowoff hose in and trying to suck air in...I was not successful! That told me certainly enough that it had a good seal. Hope this helps.
I was told not to use plastic when brewing mead due to bacteria, is this a legit problem?
P F on Dec 23, 2015
BEST ANSWER: Plastic fermentors are suitable for any fermentation including mead. Bacteria is not a problem provided that you clean and sanitize properly and do not scratch the plastic.
I have a standard NB blow off tube for a standard 6.5 gallon glass Carboy. Will this fit into the opening of the lid provided?
F R on Sep 21, 2016
BEST ANSWER: Yes, the whole dimensions are the same size in this lid as they are for the standard carboys.
I have read leaving beer in secondary for a long time in plastic can be harmful. is that still the case or have these new products gotten better?
N A on Mar 24, 2016
BEST ANSWER: The main reason to use glass for secondary is that plastic vessels don't always seal quite as well as glass, and oxygen can leak in and cause staling. Of course this isn't a problem during primary fermentation, but if you're going to do a secondary, especially a long one, glass is still usually better. Using plastic raises the risk a little, but it doesn't necessarily ruin it. That said, I've used plastic for a secondary before, and I've never experienced anything negative myself.
I have the big mouth bubbler with the dual port lid and a blow off tube. I really like the whole system but I have not used the blow off tube yet because it does not give a snug fit into the dual port lid. What is the trick to get a good fit, I just don't feel comfortable with the way it fits now.
B U on Nov 1, 2015
BEST ANSWER: Thanks for contacting us. Tricks include having the right angle for the tube so that it is pulled by the free end to make a seal at an angle- that is how most common set ups allow for it to seal. You can also try using some teflon tape of some sort to help get it snug. The tubing will vary based on kinks temperatures and many factors. You can try putting one end in hot water and then stretching the tubing over the lid port to stretch it and then it may fit more snugly inside the tube. Since it is there to allow yeas to leave as needed and fermentation is pushing everything away nothing can get in anyway and the tubing just prevents big messes and makes cleaning up easier.

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